Question

What is the length of CD? In this diagram, AABC ~ AEDC. 20-% c * 7 21​

Answer 1

`(BC)/(DC)=(AC)/(EC)`

`(20-x)/(x) =(21)/(7)`

`(20-x)/(x) =3`

`20-x=3x`

`4x=20`

`x=5`

`So, CD=5`

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